IRWIN Tools 1881078 Impact Performance Series Masonry 6-Inch Drill Bit Mixed Set, 5-Piece Built for maximum durability and long life with impact drivers Innovative pressed carbide tip with aggressive cutting angles for faster drilling and longer bit life One-piece construction withstands higher torque loads than standard quick-change bits Black oxide finish resists corrosion and increases life of bit Manufactured with heavy-duty, cold-forged, high-grade steel to withstand high torque output